1. Root pressure can develop only when the root is:
A.
Living and metabolically active
B.
Completely dried
C.
Dead and decayed
D.
Separated from the plant
Correct Answer:
Living and metabolically active
Explanation:
Root pressure requires living root cells because their metabolic activity helps in the accumulation of solutes and water uptake.
2. What happens to root pressure when the root cells are killed?
A.
It increases greatly
B.
It remains unchanged
C.
It disappears
D.
It changes into transpiration pull
Correct Answer:
It disappears
Explanation:
Dead root cells cannot perform the metabolic activities needed for root pressure, so root pressure disappears.
3. Which condition is essential for the development of root pressure?
A.
A living root system
B.
A completely dry root system
C.
A root without root hairs
D.
A dead root system
Correct Answer:
A living root system
Explanation:
Root pressure is produced through the activity of living root tissues, making a living root system essential.
4. Why are living root cells needed for root pressure?
A.
They carry out active metabolic processes
B.
They prevent all water movement
C.
They stop the absorption of minerals
D.
They remove water from the xylem
Correct Answer:
They carry out active metabolic processes
Explanation:
Living root cells use metabolic energy to help accumulate substances in the root, which supports water entry and root pressure.
5. If the root of a plant is damaged severely, root pressure will usually:
A.
Become stronger
B.
Be unaffected in every case
C.
Decrease or stop
D.
Turn into root respiration
Correct Answer:
Decrease or stop
Explanation:
Severe root damage affects living root tissues, so the processes responsible for root pressure may decrease or stop.
6. A dead root cannot produce root pressure because it cannot:
A.
Carry out necessary cellular activities
B.
Remain in the soil
C.
Become longer
D.
Store starch permanently
Correct Answer:
Carry out necessary cellular activities
Explanation:
Root pressure depends on cellular activities of living roots, which cannot occur in a dead root.
7. Which root would be most likely to produce root pressure?
A.
A fresh, healthy root
B.
A completely dried root
C.
A boiled root
D.
A decaying root
Correct Answer:
A fresh, healthy root
Explanation:
A fresh, healthy root contains living cells capable of performing the activities required for root pressure.
8. Root pressure is considered a process involving living roots because it depends on:
A.
Root cell activity
B.
Only sunlight falling on leaves
C.
Only wind movement
D.
The hardness of the stem
Correct Answer:
Root cell activity
Explanation:
Living root cells actively participate in the processes that lead to the development of root pressure.
9. What is the effect of boiling a root on its ability to develop root pressure?
A.
It increases its ability
B.
It does not affect its ability
C.
It destroys the living cells and prevents root pressure
D.
It changes the root pressure into transpiration
Correct Answer:
It destroys the living cells and prevents root pressure
Explanation:
Boiling destroys living root cells, so the root can no longer carry out the activities necessary for root pressure.
10. Which statement about root pressure is correct?
A.
It requires living root tissues
B.
It is produced by dead roots only
C.
It occurs only in dried roots
D.
It does not depend on root condition
Correct Answer:
It requires living root tissues
Explanation:
Root pressure depends on the functioning of living root tissues, so dead or severely damaged roots cannot normally produce it.
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